When two point charges of magnitude q1 and q2
are separated by a distance, r, the magnitude of
the electrostatic force between them is f. what
would be the magnitude of the electrostatic force
between point charges 2q1 and 4q2 when
separated by a distance of 2r?
(1) f (3) 16f
(2) 2f (4) 4f

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m